Grinding machine



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GRINDING MACHINE A Filed Jan. 22, 19:52 5 sheets-sheet 1 @et 9, i934. AGwBlNNS mmm" l GRINDING MACHINE Filedl Jan. 22, l1932 A I5 Sheets-Sheet2 Patented Oct. 9, g34

UNIT TES GRINDING MACHINE George W. Binns,

Cincinnati Grinders Cincinnati, Ohio, assigner td Incorporated,Cincinnati,`

Ohio; a corporation of Ohio Application January 22, 1932, Serial No.588,168

19 Claims.

This invention relates to improvements in grinding machines andespecially to improvements in a centerless grinder.

An object of this invention is the provision of an improved centerlessgrinder for grinding the terminal surface of small headed objects.

Another object of the invention is the provision of improved means forloading, presenting and ejectng work pieces of an irregular shape.

A further object of the invention is the provision of improved means forautomatically adjusting the members of the grinding throat of acenterless grinder for holding, rotating and ejecting headed articlessuch as studs, tappets and the like which require the flat headedsurface thereof to be ground or finished.

Other objects and advantages of the present invention should be readilyapparent by reference to the following specification taken inconjunction with the accompanying drawings and it is to be understoodthat any changes may be made in the exact structural details there shownand described within the scope of the appended claims without departingfrom or exceeding the spirit of the invention.

In the drawings; n

Figure 1 is an elevational View of a centerless grinder embodying theimprovements of this invention. i

Figure 2 is a top plan view of the machine illustrated in Figure 1.

Figure 3 is a fragmentary sectional view taken on line 3-3 of Figure 1.

Figure 4 is a fragmentary sectional view taken on line 4-4 of Figure 3.

Figure 5 is a sectional view taken on line 55 of Figure 3.

Figure 6 is a sectional View taken on line 6-6 of Figure 4.

Figure 7 is a fragmentary elevational view of the machine shown inFigures 1 and 2 and as seen particularly from line 7-7 of Figure 1.

Figure 8 is a sectional view through the regulating wheel substantiallyon line 8 8 of Figure 9.

Figure 9 Figure 8.

Throughout the several views of the drawings, similar referencecharacters are employed to denote the same or similar parts.

A machine of this invention is particularly adapted for the grinding ofthe flat terminal surface of headed articles such as headed studs,tappets or the like. The flat surface of these items is at right anglesto the axis of revolution is a sectional view on line 9-9 of of the stemor body portion. of the article extendfing from the heads. In the past,diiculty has been experienced in properly positioning or mounting thework for proper presentation to the operative surface of a grindingwheel. By

this invention, these diiculties are obviated and ledge 15 for thetruing tool bracket 15.1- The i truing tool 17 is supported by andactuated relative to the base 16. The grinding wheel is adapted to berotated in a clockwise direction at a high or grinding rate of speed.

The bed 10 is further provided on its yupper AFh surface with ways 18for a slide 19 shiftab'le longitudinally of the bed toward and fromV thegrinding wheel. The slide 19 provides additional guideways 20 for anupper slide or housing '21 which is movable relative to the lower slide19 as well as therewith. Secured to the h0using21 is a head 22 in whichis journaled a spindle 23 for a regulating wheel 24. The wheel 24 *ismounted on the spindle for adjustment relative thereto which will bedescribed in detail later.

It will be noted that the side or lateral face of this regulating wheelis employed for controlling the rotation of the work.

The upper and lower slides 19 and 21 -are adapted to be shifted as aunit relative to the bed toward the grinding wheel for effecting a feedbetween the work piece supported by the slides in a manner that will bedescribed in detail later. The slides are clamped to one another bymeans of a clamp 25 and the upper slide or housing 21 has oscillatablyjournaled therein a swivel nut 26 which is in threaded engagement withan adjusting screw 27. The outer end of the screw 27 is rotatablymounted in a. bracket 28 secured to an extending portion 29 of the bed.A hand wheel 30 is secured to the screw 27 at a point beyond the bracket28 whereby the said screw may be rotated for eiecting the axial travelof the nut 26 and parts actuated thereby. In the normal use of themachine the slides 19 and 21 are cyclically fed toward and from thegrinding wheel thereby reducing the work to the desired size and withthe proper iinish. For this purpose the swivel nut 26 has secured to itan operating lever or handle 31 which is oscillatable through an arc of90 degrees from the position shown in Figure 1 at which time the slidesare in a retracted position. In order that the slides may beindependently adjusted for set-up purposes and the like, the lower slide19 is provided with clamps 32 which secure the lower slide to the bedand upon release of clamp 25 the upper slide or housing 21 may be movedrelative thereto.

The inner or forward end of the slide 19 has secured to it a bracket 33which carries the work support and loading and ejecting mechanism. Thebracket 33 is provided with a bearing portion 34 in which is journaledone end of the shaft 35 which extends along the front side of themachine from the said bracket to the rear end of the machine where it isagain journaled in a bracket 36 secured in any desirable manner to therear surface of the housing or upper slide 21. Secured to the shaft 35adjacent the bearing 34 is a toggle arm 37 having a pivoted connectionat 38 with a second toggle arm indicated in its entirety by the numeral39. The toggle arm 39 is formed in two telescoping members 40 and 41,the former extending about the latter. The member 40 at the point ofpivotness 38 is provided with an enlarged head which forms a shoulder 42and the member 41 is likewise formed on one end with an enlarged head toprovide a shoulder 43. Surrounding the arm 39 and abutting on oppositeends with the shoulders 42 and 43 is a spring 44 tending to axiallyshift the members 40 and 41 relative to each other. To preventinadvertent disassociation of the telescoping members 40 and 41 the headof the member 40 is provided with an aperture through which passes abolt or the like 37a having on its outer end a head engageable with theend of the outer surface of the head of member 40. The threaded end ofthe bolt 37a is received in a threaded aperture formed in the inner endof the member 41. By reference to Figure 3 it will be noted thatoscillation of the toggle arm 37 will iirst take up the lost motionbetween the bolt head and head of member 40,whereupon the members 40 and41 will move in unison. The head 45 of the member 41 is received in arecess or opening 46 formed in a work rest block 47, and has passingtherethrough a pivot 47A whereby the block 47 is pivoted to the arm 39.The block 47 is provided at its lower end with a perforation throughwhich passes the pivot shaft 48 having its opposite ends secured inbearings 49 extending upwardly from the bracket or plate 44. The upperend of the block 47 is furcated to provide ears 50 and 51 in which ismounted a shaft 52 for lateral or pressure roller 53. On the forwardface of the block 47 there is secured as by screws or bolts 54 a workrest blade 55. The upper supporting surface of the blade 55 is inclinedas shown at 56 in Figure 6. The blade 56 inclines in the direction ofthe regulating wheel 24 and forms with the operative surface thereof aWork supporting trough in which the stem 57 of the work piece ispositioned. By reference to Figure 4 it will be noted that the head 58of the work piece lies beyond the vertical edge of the work rest blade55. It will also be noted by reference to Figures 4 and 6 that the blade55 is provided with elongated apertures 59 through which the clampingbolts 54 extend and whereby the said blade may be vertically adjustedrelative to the block 47 for properly positioning the axis of the workwith the axis of the grinding and regulating wheels.

The block 47 has also secured to its inner face a stop 60 which engagesthe terminus of the work piece and establishes the size between the saidterminus of the work and the portion of the head being ground. Byreference to Figure 4 it will be noted that screw 61, whereby the stop60 is secured to the block 47, is not centrally of the length of saidblock so that if the block were turned end for end a dierent size ormeasurement will exist between the terminus of the work that engages theblock and the terminus being ground. In this way it is possible to grindtwo sizes of work pieces by simply reversing the position of the stop 6Drelative to the block 47.

As was noted above the shaft 35 extends from the support or bracket 33to one end of the bed where it is mounted in the bearing 36. This shaft35 has secured to it beyond the bearing 36 an arm 62 which is pivoted at63 to one end of a link 64. The other end of the link 64 is pivoted at65 to the operating handle or lever 31 intermediate its ends. From thisit will be seen that oscillation of the lever 31 for eifecting movementof the regulating wheel and work will likewise effect oscillation of theshaft 35.

In normal operation with the handle 31 in the position shown in Figure1, the wheels are then retracted from one another and the worksupporting block 47 and toggle mechanism are in the position shown indotted outline in Figure 3. In this position the work is mounted on theblade. In order to prevent the work from rolling off the inclined face56 of the blade, there is provided a spring nger 66 secured as by capscrews or the like 67 to the forward face of the block 47 below thelower edge of the work rest blade. It will be noted that the finger 66is provided at its upper end with an outwardly projecting lip 68 havingthe surface 69 thereof formed parallel with the adjacent face of theregulating wheel 24, and that when in operative position this face 69 isfree of the operative face of the regulating wheel 24. After the workpiece has been placed on the blade 55 the handle 31 is oscillated in acounter-clockwise direction for shifting the slides 19 and 21 toward thegrinding wheel to operatively associate the work and wheel.Simultaneously with this movement of the handle 31 the shaft 35 isoscillated in a counter-clockwise direction thereby raising the arm 37from the dotted line position in FigLue 3 to the solid line positiontherein and thereby shifting the members 40 and 41 relative to oneanother compressing the spring 44 and placing the stem of the Work intooperative engagement with the face of the wheel 24. This movement of theparts takes place during the first half of the oscillatory movement ofthe handle 31 from the vertical position shown in Figure 1 whereupon theparts are fed toward the grinding wheel to effect the stock removal fromthe work. In other words, after the work is brought into operativeengagement with the regulating wheel, the spring 44 is merely compressedfor maintaining a yielding action on the block and yieldingly holdingthe Work in frictional engagement with the wheel. f

After the work has been reduced to the desired size and nish the handle31 is reversely actuated, thereby retracting the work from the grindingwheel and shifting the toggle arms from "Lemire the solid line to thedotted line position. After the work has passed the active face of thegrinding wheel, it is desired to eject same from the work rest blade.For this purpose the block 47 has pivoted to it at 70 the ejector arm 71which is adapted to oscillate along the said front face of the block 47.The ejector arm 71 has secured to its upper end the head 72 which isadapted to engage the end of the work contacting with the stop block 60.By reference to Figure 3 it will be noted that the block 60 contactswith the work along one edge of the terminus of the work and that thehead 72 lies in a plane parallel with the stop block in a position toengage the said terminus of the work at a point laterally spaced fromits point of contact with the stop block. The ejector arm 71 isoscillated to and held in its normal position by means of a spring 73received in a socket 74 formed in the arm and abutting with a shoulder75 formed on the block 47. The movement of the arm 71 is limited underthe influence of the spring by means of a lug 76 formed on the l lowerend thereof and engaging with the raised pivoted at 80 to the bracket33. The cam 79 has secured to it at 81 one end of a spring 82, the

other end of which is secured to the shaft 48. An adjustable stop screw83 carried by the cam 79 limits its movement about the pivot 80 underthe inuence of the spring 82.

The operation of the ejector is as follows: As the block 47 isoscillated away from the active face of the regulating wheel 24 itcarries with it the ejector arm 71. As soon as the work has passed thelateral limit or" the grinding wheel the barrel shaped roller 77 engageswith the cam face 78 of cam 79 which oscillates the ejector arm 71 in aclockwise direction as seen in Figure 4 thereby bringing the head 72into contact with the end of the work piece and shifting said work pieceaxially olf of the work rest blade into a suitable receptacle placed forreceiving same. As the arm nears the limit of its movement away from theface of the regulating wheel the roller snaps over the end of the camand the arm is returned to its normal position by means of the spring73. After a new work piece has been placed on the Work rest blade andthe parts again operated toward their working position the roller 77engages with the cam 79 oscillating same in a clockwise direction asseen in Figure 3 expanding the spring 82. Just before the parts are intheir normal operative position the roller 77 rides off of the cam 79where upon the spring 82 returns it to its normal position.

From the foregoing it will be noted that there has been provided amachine for semi-automatically grinding the flat terminal portion ofheaded articles such as tappets and the like and that this machine issubstantially automatically operated for properly positioning the workrelative to the Wheels, feeding the work into the grinding wheel andejecting same from the machine.

It will be noted that the work piece contacts. with the lateral or sideface of the regulating wheel which extends in a plane at right angles tothe axis of rotation of the spindle 23. This wheel is made of suitableabrasive material for affording the proper frictional grip between thework and wheel. In order that the wheel may eiciently function, it isnecessary that its active face '84 be periodically trued or re-surfaced.For this reason the head 22 carries a bracket 85 supporting a truingtool or diamond 86, a hand wheel 87 being provided for verticallyshifting the tool 86 across the active face of the regulating wheel.

As the face 84 is trued or re-surfaced itrecedes from its originalposition thereby throwing the alignment of the machine out and tocompensate for this mis-alignment the wheel 24 is adapted to be axiallyshifted relative to its spindle. For this purpose the spindle 23 isprovided with a tapered nose 88 terminating in a threaded portion 89 onwhich is threadingly mounted a nut 90. A split sleeve 91 is providedhaving a tapered bore 92 adapted to receive the tapered nose 88 of thespindle. The outer surface of the sleeve 91 is plane and forms a bearingfor a wheel collet 93 on which the regulating wheel 24 is mounted. Thewheel being clamped between a collar or flange 94 formed integral withthe collet 93 and a clamp nut 95 threadingly mounted thereon. The collet93 and sleeve 91 are keyed to one another as at 96 to prevent anyrelative rotative movement but permit axial shifting one with respect tothe other. Likewise the sleeve 91 and spindle nose 88 are keyed to oneanother at 97 for preventing any relative rotative movement whilepermitting an axial shifting of one with respect to the other. Thesleeve 91 is further provided in its forward end with' an enlargedcounterbore 98 in which is positioned the nut 90 which is also adaptedtc Contact with the base or shoulder formed in the end of thecounterbore 93 and whereby the sleeve 91 is shifted relative to the nose88 of the spindle. The collet 93 is provided with threaded bores 99receiving the threaded end of bolts 100.

The bolts are provided on their outer end with cylindrical heads 101partially received in sockets 102 formed in the split sleeves near theirouter ends and at points diametrically opposite one another. The boltsare further provided with screw driver slots 108 whereby they may berotated.

By this construction and after retruing the active faceV 84 of theregulating wheel, the nut is loosened or backed away from the shoulderof the counter-bore 98 thereby permitting the sleeve to be shiftedslightly relative to the tapered nose 88 of the spindle for breaking thejoint between them. This permits the sleeve to contract thereby reducingits outer diameter and loosening the joint between itself and the collet93. The screws are then rotated which effects the shifting of the colletalong the outer plane surface of theL sleeve either toward the work oraway from the work depending upon the direction of actuation of saidscrews. After the regulating wheel has been adjusted to the desiredpoint the nut 90 is again actuated for forcing the sleeve 91 on to thetapered nose of the spindle causing an expansion of the said sleeve totake place for clamping the collet and sleeve to one another and therebylocking the regulating wheel in its adjusted position.

What is claimed is:

1. In a grinding machine of the class described,

the combination of a bed, a grinding wheel rotatably mounted thereon, afriction drive wheel rotatably mounted on the bed, a work rest blade forsupporting; a work piece and oscillatable toward the friction drivewheel for operatively en gaging the work with the friction drive wheelwhereby it is rotated while in. operative engagement with the grindingwheel, means supporting the regulating wheel and oscillatable work restfor movement relative to the bed toward the grinding wheel for effectingstock removal from the work, the work rest blade being oscillatable froma position remote from the friction drive wheel to permit replacement ofthe work to a position adjacent the wheel, and a single means foreffecting the oscillation of the work rest blade and movement of theunit toward and from the grinding wheel in sequential order.

2. In a grinding machine for grinding the terminal portion of headedarticles the combination of a bed, a grinding wheel rotatably mountedthereon, a slide supported by the bed for movement toward and from thegrinding wheel, a friction drive wheel rotatably mounted on the slideand movable therewith, a work rest blade oscillatably mounted on theslide for movement toward and from the friction drive wheel, anoscillatable ejector arm adjacent the work rest blade, and means foroscillating the blade toward the friction drive wheel to operativelf,7associate the work supported thereby with the wheel and to oscillate thelade from the wheel and operate the ejector' arm to discharge the workfrom the blade.

3. In a grinding machine for grinding the terminal `portion of headedarticles the combination of a bed, a grinding wheel rotatably mountedthereon, a slide supported by the bed for movement toward and from thegrinding wheel, a friction drive wheel rotatably mounted on the slideand movable therewith, a work rest blade osciliatably mounted on theslide for movement toward and from the friction drive wi cel, anoscillatacle ejector arm adjacent the work rest blade, means foroscillating the blade toward the friction drive wheel to operativelyassociate the work supported thereby with the wheel and to oscillate theblade from the wheel and operate the ejector arm to discharge the workfrom the blade, lateral pressure rolls for engaging the work at a pointon the other side of the center of the work from that which engages thefriction drive wheel and for holding the work in proper peripheralengagement with the work rest blade and friction drive wheel, and a stopmember adjacent the work rest for limiting the axial movement of thework along the blade.

4. In a grinding machine for grinding the terminal portion of headedarticles the combination Y of a bed, a grinding wheel rotatably mountedthereon, a slide supported by the bed for movement relative theretotoward and from the grinding wheel, a friction drive wheel rotatablymounted on the slide, a bracket supported by the slide, a block forsupporting a work piece pivotaliy mounted on the bracket for oscillationbetween two extreme positions and when in one position is adjacent thefriction drive wheel and when in its second position is remotetherefrom, a shaft oscillatably journaled on the slide, a toggleconnection between the block and shaft whereby oscillation of the shafteffects corresponding oscillation of the block, and a manually actuablelever for effecting the oscillations of the shaft.

5. In a grinding machine for grinding the terminal portion of headedarticles the combination of a bed, a grinding wheel rotatably mountedthereon, a slide supported by the bed for movement relative theretotoward and from the grinding wheel, a friction drive wheel rotatablymounted on the slide, a bracket supported by the slide, a block forsupporting a work piece pivotally mounted on the bracket for oscillationbetween two extreme positions and when in one position is adj cent thefriction drive wheel and when in its second position is remotetherefrom, a shaft oscillatably journaled on the slide, a toggleconnection between the block and shaft whereby oscillation of the shafteiects corresponding oscillation of the block, a manually actuable leverfor effecting the oscillations of the shaft, and an operative couplingbetween the lever and slide whereby the block is oscillated in timedsequence with the movement of the slide toward and from the grindingwheel.

6. In a grinding machine of the class described, the combination of awork rest blade, an Voscillatable support therefore, a friction drivewheel adjacent the blade when in grinding position, the blade having aninclined operative surface inclining toward the operative surface of thefriction drive wheel, and means preventing disassociation of the workand inclined surface of the blade prior to engagement of the work withthe wheel.

".1, In a grinding machine of the class decribed, the combination of awork rest blade, an oscillatable support therefore, a friction drivewheel adjacent the blade when in grinding position, t Le blade having aninclined operative surface inclining toward the operative surface of thefriction drive wheel, means preventing disassociation of the work andinclined surface of the prior to engagement of the work with the wheel,pressure rolls carried by the blade support for engagement with the workfor holding same against the inclined surface of the blade and frictiondrive wheel, and yielding means yieldably oscillating the blade supporttoward the friction drive wheel.

8.111 a grinding machine of the class described, the combination of awork rest blade, an oscillatable support, a friction drive wheeladjacent the blade when in grinding position, the blade having aninclined operative surface inciining toward the operative surface of thefriction drive wheel, means preventing disassociation of the work andinclined surface of the blade prior to engagement cf the work with thewheel, pressure rolls car'ied by the blade support for engagement withthe work for holding same against the inclined surface of the blade andthe friction drive wheel, yielding means yieldably oscillating the bladesupport toward the friction drive wheel, a grinding wheel for operationon the terminal portion of the work while held in engagement with thework rest blade and friction drive wheel, means supporting the work restblade support and friction drive wheel for movement as a unit toward thegrinding wheel for effecting a stock removal from the work, and a commonmeans for rst oscillating the blade support to operatively associate thework thereon and friction drive wheel and t0 subsequently feed the unittoward the grinding wheel and effect the desired stock removal.

9. In a grinding machine of the class described for grinding theterminal portion of headed cylindrical work pieces, the combination of awork rest blade for engaging the cylindrical shank of the work piece andhaving the head thereof projecting beyond the work rest, a grindingWheel for operation on the head, a friction drive wheel for engaging theshank of the work drive wheel, said mechanism comprising an arm ingwheel for operation on the head, a friction drive wheel, said mechanismcomprising an arm work, means operable for shifting the arm wheel andside face of the friction drive WheelV for effecting and controlling itsrotation, an oscillatable support for the blade,'means for oscillatingthe support toward and from the grinding wheel yto operatively associateand disassociate the shank of the work and the friction drive wheel, andan ejector mechanism for discharging the work from the blade when thesupport is oscillated in a direction away from the friction drivewheel.`

' 1G. In agrinding machine of the class described for grinding theterminal portion of headed cylindrical work pieces, the combination of aworlrrest blade for engaging the cylindrical shank of the work piece andhaving the head thereof projecting beyond the work rest, a grindingwheel'for operation on the head, a friction drive wheel for engaging theshank of the work for eecting and controlling its rotation, anoscillatable support for the blade, means for oscillating the supporttoward and from the grinding'wheel to" operatively associate anddisassociate the shank of the work and the friction drive wheel, anejector mechanism for discharging the work from the blade when thesupport is oscillated in a direction away from the friction pivotallymounted on the support, a head on the arm in alignment with the terminalportion of the work, yieldable means for normally holding the ejectorhead out of engagement with the work, and means operable for shiftingthe arm against its yielding means for causing the head to engage theterminus of the work and shift same from the blade.

1l. In a grinding machine of the class described for grindingr theterminal portion of headed cylindrical work pieces, the combination cfawork rest blade for engaging the cyiindrical shank of the work piece andhaving the head thereof projecting beyond the work. rest, a grinddrivewheel for engaging the shank of the work for effecting and controllingits rotation, an oscillatable support for the blade, means foroscillating the support toward and from the grinding wheel tooperatively associate and disassociate the shank of the work and thefriction drive wheel, an ejector mechanism for discharging the work fromthe blade when the support is oscillated in a direction away from thefriction pivotally mounted on the support, a head on the arm inalignment with the terminal portion of the work, yieldable means fornormally holding the ejector head out of engagement with the against itsyielding means for causing the head to engage the terminus of the workand shift same from the blade including a barrel-shaped vroller carriedby the arm, and a cam mounted adjacent the work rest blade support forengagement with the barrel-shaped roller for effecting the movement ofthe ejector arm.

l2. In a grinding machine of the class de- "scribed, the combination ofa bed, a grinding r"wheel rotatably mounted on the bed, a friction drivewheel rotatably supported by the bed, the grinding wheel being adaptedto be rotated at a high rate of speed and utilizing its peripheral,surface for effecting a stock removal from the 'work while the frictiondrive wheel is offset as respects the grinding wheel and adapted to berotated at a slow Work controlling rate of speed and utilizing its sideface for frictionally controlling the rotation of the work, the grindingbearing a definite relation to one another during the grinding operationand the said side face of the friction drive wheel being subject towear, means supporting a work piece for proper engagement with theperipheral face of the grinding wheel and side face of the frictiondrive wheel, a spindle for the grinding wheel, a spindle for thefriction drive wheel, and means for shifting the friction drive wheelrelative to its spindle for maintaining the proper relationship betweenthe operative faces of the grinding wheel and friction drive wheel. ii3. In a grinding machine of the class described, the combination of abed, a grinding Wheel rotatably mounted on the bed, a friction drivewheel rotatably supported by the bed, the grinding wheel being adaptedto be rotated at a. high rate of speed and utilizing its peripheralsurface for effecting a stock removal from the work while the frictiondrive wheel is offset as respects the grinding wheel and adapted to berotated at a slow work controlling rate of speed and utilizing its sideface for frictionally controlling the rotation of the work, the grindingwheel and side face of the friction drive wheel bearing a definiterelation to one another during the grinding operation and the said sideface of the friction drive wheel being subject to wear, means supportinga work piece for proper engagement with the peripheral face of thegrinding Wheel and side face of the friction drive wheel, a spindle forthe grinding Wheel, a spindle for the friction drive wheel, means forshifting the friction driveV wheel relative to its spindle formaintaining the proper relationship between the operative faces ofgrinding wheel and friction drive wheel, said means comprising a wheelcollet, a sleeve on the spindle supporting the collet, and means forshifting the collet relative to the sleeve and clamping said collet inits adjusted :positions to the sleeve.. 1

14. In a mechanism for operatively associating a work piece with afriction drive wheel the combination with the friction drive wheel, of awork rest blade, a pivotally mounted support for the blade oscillatabletoward the friction drive wheel for operatively associating the work onthe blade with the wheel and oscillatable from the friction drive wheelto disassociate the work and wheel and to effect a replacement of thework on the blade, and means for effecting the oscillation of thesupport, said means including an oscillatable shaft, and a toggleconnection between the shaft and support whereby said support is lockedin either of its operative positions.

l5. In a mechanism for operatively associating a Work piece with afriction drive Wheel the combination with the friction drive wheel, of awork rest blade, a pivotally mounted support for the blade oscillatabletoward the friction drive wheel for operatively associating the work onthe blade with the wheel and oscillatable from the friction drive wheelto disassociate the work and wheel and to effect a replacement of thework on the blade, and means for effecting the oscillation of thesupport, said means including an oscillatable shaft, a toggle connectionbetween the shaft and support whereby said support is locked in eitherof its operative positions, and yielding means associated with thetoggle connection whereby the work is yieldably held in engagement withthe friction drive wheel.

16. In a mechanism for operatively associating a Work piece With afriction drive Wheel the combination With the friction drive Wheel, of awork rest blade, a pivotally mounted support for the blade oscillatabletoward the friction drive Wheel for operatively associating the Work onthe blade with the Wheel and oscillatable from the friction drive Wheelto disassociate the Work and Wheel and to effect a replacement of thework on the blade, means for effecting the oscillation of the support,and work ejecting means carried by the support operable during theoscillation of the support from the friction drive wheel for ejectingthe Work from the blade.

17. In a mechanism for operatively associated a Work piece with afriction drive Wheel the combination with the friction drive wheel, of aWork rest blade, a pivotally mounted support for the blade oscillatabletoward the friction drive wheel for operatively associating the Work onthe blade with the Wheel and oscillatable from the friction drive Wheelto disassociate the work and wheel and to effect a replacement of thework on the blade, means for effecting the oscillation of the support,and Work ejecting means carried by the support operable during theoscillation of the support from the friction drive wheel for ejectingthe Work from the blade including a lever pivotally mounted on thecarrier and forming a stop for the Work during its engagement with thefriction drive wheel, a fixed cam, and an abutment on the lever forengagement with the cam to effect the movement of the lever relative toits pivot.

18. In a mechanism for operatively associating a Work piece with afriction drive Wheel the combination with the friction drive Wheel, of awork rest blade, a pivotally mounted support for the blade oscillatabletoward the friction drive wheel for operatively associating the Work onthe blade with the Wheel and oscillatable from the friction drive wheelto disassociate the work and Wheel and to effect a replacement of theWork on the blade, means for effecting the oscillation of the support,and work ejecting means carried by the support operable during theoscillation of the support from the friction drive Wheel for ejectingthe work from the blade including a lever pivotally mounted on thecarrier and forming a stop for the Work during its engagement With thefriction drive Wheel, a fixed cam, an abutment on the lever forengagement with the cam to effect the movement of the lever relative toits pivot, and means mounting the cam to render same inoperative duringreverse movement of the support.

19. n a mechanism for operatively associating a Work piece With afriction drive Wheel the combination with the friction drive wheel, of awork rest blade, a pivotally mounted support for the blade oscillatabletoward the friction drive wheel for operatively associating the Work onthe blade with the Wheel and oscillatable from the friction drive wheelto disassociate the Work and Wheel and to effect a replacement of theWork on the blade, means for effecting the oscillation of the support,Work ejecting means carried by the support operable during theoscillation of the support from the friction drive Wheel for ejectingthe work from the blade including a lever pivotally mounted on thesupport and forming a stop for the Work during its engagement with thefriction drive Wheel, a Xed cam, an abutment on the lever for engagementwith the cam to effect the movement of the lever relative to its pivot,means mounting the cam to render same inoperative during reversemovement of the support, and means associated with the friction driveWheel for maintaining the proper relationship between the said wheel andWork rest blade.

GEORGE W. BINNS.

lbu

